Because it's a freaking lie!

I have anyone whitelisted.  I am very picky about it.  Have to have seen the guest several times, and the white list only stays up till a year after the visit.  Otherwise I want to make sure ladies contact me for a reference so I can confirm it is still that same guy, phone #'s match/emails and that sort of thing.  To many try to share accounts and even email addresses, so I want to make sure the ladies stay safe by making sure it is actually the guy I saw and not someone trying to use that to see them.

I had one long time client that I have recently stopped seeing because of his bad behavior and took him off of my whitelist. Needless to say, he was not thrilled.  
A mention of a little weight gain may or may not warrant for her to exclude you off her whitelist, but if she does, then you will know why.